Safety requirements such as external electric shock and lightning protection.
In this case, two layers of protection are required. The outer layer is not used to eliminate interference, but for safety reasons. To ensure the safety of people and equipment, multiple points must be grounded. Click here to learn more about cable technology The inner layer is to prevent interference, so it must be grounded at a single point.
Single-ended ground:
Single-ended grounding of shielded cables is helpful to avoid interference from low-frequency electric fields. In other words, it can avoid frequency interference whose wavelength λ is much larger than the cable length L. L
Grounding the cable shield at one end prevents low frequency current noise on the shield. This current internally causes common-mode interference voltages and can potentially interfere with analog devices.